A1 Journal article (refereed), original research

The effect of polyacrylic acid and reaction conditions on nanocluster formation of precipitated calcium carbonate on microcellulose


Publication Details
Authors: Laukala Teija, Kronlund Dennis, Heiskanen Isto, Backfolk Kaj
Publisher: Springer Verlag (Germany)
Publication year: 2017
Language: English
Related Journal or Series Information: Cellulose
Volume number: 24
Issue number: 7
Start page: 2813
End page: 2826
Number of pages: 14
ISSN: 0969-0239
JUFO-Level of this publication: 2
Open Access: Not an Open Access publication

Abstract

The precipitation of micro- and nanoparticles of calcium carbonate onto lignocellulosic microfibers was investigated at different microfiber concentrations with and without polyacrylic acid (PAA), i.e. a polymer commonly used to form polymer-induced liquid precursors of CaCO3. Concentrations of PAA, Ca(OH)2, CO2 and microfiber were varied in order to study the impact of reaction conditions on PCC formation in a batch reactor operated at ambient temperature. High resolution scanning electron micrographs of the samples show that both microfiber concentration and PAA dosage affected the nucleation and crystal growth of PCC filler on cellulosic fiber. Interestingly, at higher microfiber concentrations, larger amount of nano-sized spherical crystals were formed on the microfibers. A higher dosage of PAA, on the other hand, resulted in less nucleation on the microfiber, suggesting a preferential bulk nucleation mechanism. A higher concentration of PAA during the precipitation also led to the formation and stabilization of amorphous CaCO3, which was supported by SEM images and XRD analysis (lack of characteristic crystal structure).


Last updated on 2018-19-10 at 07:55